| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Weatherup, Rs
University of Oxford
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (28/28 displayed)
- 2024The Role of Salt Concentration in Stabilizing Charged Ni-Rich Cathode Interfaces in Li-ion Batteries
- 2024Removal and Reoccurrence of LLZTO Surface Contaminants under Glovebox Conditionscitations
- 2023Effect of current density on the solid electrolyte interphase formation at the lithium∣Li6PS5Cl interfacecitations
- 2022Gently does it!: in situ preparation of alkali metal–solid electrolyte interfaces for photoelectron spectroscopycitations
- 2022Effect of current density on the solid electrolyte interphase formation at the lithium∣Li6PS5Cl interfacecitations
- 2022In situ and operando characterisation of Li metal – Solid electrolyte interfacescitations
- 2022Electrolyte reactivity at the charged Ni-rich cathode interface and degradation in Li-ion batteriescitations
- 2022Electrolyte Reactivity at the Charged Ni-Rich Cathode Interface and Degradation in Li-Ion Batteries.
- 2022Electronic interactions and stability issues at the copper-graphene interface in air and in alkaline solution under electrochemical controlcitations
- 2020Understanding metal organic chemical vapour deposition of monolayer WS2: the enhancing role of au substrate for simple organosulfur precursorscitations
- 2020The origin of chemical inhomogeneity in garnet electrolytes and its impact on the electrochemical performancecitations
- 2020Graphene-passivated nickel as an efficient hole-injecting electrode for large area organic semiconductor devicescitations
- 2020Understanding metal organic chemical vapour deposition of monolayer WS<sub>2</sub>: the enhancing role of Au substrate for simple organosulfur precursors.
- 2019Reactive intercalation and oxidation at the buried graphene-germanium interface
- 2018Compressive Behavior and Failure Mechanisms of Freestanding and Composite 3D Graphitic Foamscitations
- 2018Insulator-to-Metallic Spin-Filtering in 2D-Magnetic Tunnel Junctions Based on Hexagonal Boron Nitridecitations
- 2017Chemical vapour deposition of freestanding sub-60 nm graphene gyroidscitations
- 2017Low temperature growth of fully covered single-layer graphene using a CoCu catalystcitations
- 2016In Situ Observations of Phase Transitions in Metastable Nickel (Carbide)/Carbon Nanocompositescitations
- 2016In Situ Graphene Growth Dynamics on Polycrystalline Catalyst Foilscitations
- 2016Time Evolution of the Wettability of Supported Graphene under Ambient Air Exposurecitations
- 2015Protecting nickel with graphene spin-filtering membranescitations
- 2015Spatial variability in large area single and few-layer CVD graphene
- 2014The role of the sp2:sp3 substrate content in carbon supported nanotube growthcitations
- 2014The influence of intercalated oxygen on the properties of graphene on polycrystalline Cu under various environmental conditionscitations
- 2014Low temperature growth of carbon nanotubes on tetrahedral amorphous carbon using Fe-Cu catalystcitations
- 2014Nitrogen controlled iron catalyst phase during carbon nanotube growthcitations
- 2012The phase of iron catalyst nanoparticles during carbon nanotube growthcitations
Places of action
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article
In Situ Observations of Phase Transitions in Metastable Nickel (Carbide)/Carbon Nanocomposites
Abstract
Nanocomposite thin films comprised of metastable metal carbides in a carbon matrix have a wide variety of applications ranging from hard coatings to magnetics and energy storage and conversion. While their deposition using nonequilibrium techniques is established, the understanding of the dynamic evolution of such metastable nanocomposites under thermal equilibrium conditions at elevated temperatures during processing and during device operation remains limited. Here, we investigate sputter-deposited nanocomposites of metastable nickel carbide (Ni3C) nanocrystals in an amorphous carbon (a-C) matrix during thermal postdeposition processing via complementary in situ X-ray diffractometry, in situ Raman spectroscopy, and in situ X-ray photoelectron spectroscopy. At low annealing temperatures (300 °C) we observe isothermal Ni3C decomposition into face-centered-cubic Ni and amorphous carbon, however, without changes to the initial finely structured nanocomposite morphology. Only for higher temperatures (400–800 °C) Ni-catalyzed isothermal graphitization of the amorphous carbon matrix sets in, which we link to bulk-diffusion-mediated phase separation of the nanocomposite into coarser Ni and graphite grains. Upon natural cooling, only minimal precipitation of additional carbon from the Ni is observed, showing that even for highly carbon saturated systems precipitation upon cooling can be kinetically quenched. Our findings demonstrate that phase transformations of the filler and morphology modifications of the nanocomposite can be decoupled, which is advantageous from a manufacturing perspective. Our in situ study also identifies the high carbon content of the Ni filler crystallites at all stages of processing as the key hallmark feature of such metal–carbon nanocomposites that governs their entire thermal evolution. In a wider context, we also discuss our findings with regard to the much debated potential role of metastable Ni3C as a catalyst phase in graphene and carbon nanotube growth.